A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled (`--app-name basic-auth`) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on `/gateway/` routes, leaving other routes such as the Job API (`/ajax-api/3.0/jobs/*`) and the OpenTelemetry trace ingestion API (`/v1/traces`) unprotected. This allows unauthenticated remote attackers to submit jobs, read job results, cancel running jobs, and inject arbitrary trace data into experiments. The issue arises from an architectural mismatch between Flask and FastAPI authentication mechanisms, where the `_find_fastapi_validator()` function fails to handle non-`/gateway/` paths, resulting in a complete authentication bypass. This vulnerability is fixed in version 3.10.0.
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Affected Vendors & Products
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History
Mon, 18 May 2026 18:30:00 +0000
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Lfprojects
Lfprojects mlflow |
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| CPEs | cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Lfprojects
Lfprojects mlflow |
Fri, 15 May 2026 14:15:00 +0000
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ssvc
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Fri, 15 May 2026 05:00:00 +0000
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Mlflow
Mlflow mlflow/mlflow |
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| Vendors & Products |
Mlflow
Mlflow mlflow/mlflow |
Fri, 15 May 2026 03:00:00 +0000
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| Description | A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled (`--app-name basic-auth`) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on `/gateway/` routes, leaving other routes such as the Job API (`/ajax-api/3.0/jobs/*`) and the OpenTelemetry trace ingestion API (`/v1/traces`) unprotected. This allows unauthenticated remote attackers to submit jobs, read job results, cancel running jobs, and inject arbitrary trace data into experiments. The issue arises from an architectural mismatch between Flask and FastAPI authentication mechanisms, where the `_find_fastapi_validator()` function fails to handle non-`/gateway/` paths, resulting in a complete authentication bypass. This vulnerability is fixed in version 3.10.0. | |
| Title | Authentication Bypass in mlflow/mlflow | |
| Weaknesses | CWE-305 | |
| References |
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| Metrics |
cvssV3_0
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Status: PUBLISHED
Assigner: @huntr_ai
Published: 2026-05-15T02:13:19.541Z
Updated: 2026-05-15T13:22:21.060Z
Reserved: 2026-02-18T02:53:33.607Z
Link: CVE-2026-2652
Updated: 2026-05-15T13:22:08.836Z
Status : Analyzed
Published: 2026-05-15T03:16:23.127
Modified: 2026-05-18T18:16:35.360
Link: CVE-2026-2652
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